Add override specifiers to Http2Stream class

[maskit]

No description provided.

[masaori335]

I'm just curious that clang-tidy's modernize-use-override is not applied to all files?

[jpeach]

On Jun 11, 2017, at 8:30 PM, Masaori Koshiba ***@***.***> wrote: I'm just curious that clang-tidy's modernize-use-override is not applied to all files?

If you are using `make tidy` to apply the changes, clang needs to be able to compile each header file stand-alone. Since many headers don’t include their prerequisites, this fails and it doesn’t make the desired changes.

[masaori335]

OK, got it. Thanks.

[zwoop]

+1